[中學] 103特招17題
若整數a的所有因數中,小於25的正因數為1,2,3,4,6,8,12,16,24,則a與720的最大公因數為何?
(A)25 (B)48 (C)72 (D )240
答案是48
想請問怎?解,謝謝您!
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